EP0219678B1 - Procédé pour contrôler la température exothermique stationaire lors de l'utilisation de résistances électriques composites dépendant de la température - Google Patents

Procédé pour contrôler la température exothermique stationaire lors de l'utilisation de résistances électriques composites dépendant de la température Download PDF

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Publication number
EP0219678B1
EP0219678B1 EP86112658A EP86112658A EP0219678B1 EP 0219678 B1 EP0219678 B1 EP 0219678B1 EP 86112658 A EP86112658 A EP 86112658A EP 86112658 A EP86112658 A EP 86112658A EP 0219678 B1 EP0219678 B1 EP 0219678B1
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EP
European Patent Office
Prior art keywords
temperature
steady state
molecular weight
peg
heat sensitive
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EP86112658A
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German (de)
English (en)
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EP0219678A1 (fr
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Shigeyuki Yasuda
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
    • H01C7/027—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element

Definitions

  • the invention relates to a method for controlling the steady state temperature of an exothermic process in heat sensitive-electrically resistant composites which are capable of performing a self-temperature control by showing the steep increase in electric resistance at certain temperatures when they are used as plane heaters.
  • PTCR Platinum Temperature Coefficient Resistors
  • barium titanate has been known as an inorganic PTCR
  • polyethylene carbon particle mixed systems have been known as an organic PTCR.
  • the barium titanate heater is disadvantageous in that it is impossible for it to bring the steady state exothermic temperature down to 70°C or below; additionally it is not appropriate for obtaining a plane heater having a large area because it is a sintered body. Besides, it is high in price. Also, its effect as a PTCR is not as high as polyethylene oxide-carbon particle mixed system. However, the polyethylene (paraffin)-carbon particle system has a compatibility problem. Therefore, it is still being studied.
  • the foregoing polyalkylene oxide-carbon particle system self-temperature control heater (i.e. exothermic) composite is highly stable, and it is a new heater with which a high PTCR effect can be expected. Furthermore, its steady state temperature of an exothermic process has the feature that, as long as the concentration of the carbon particles stays within a certain range, it remains almost constant even when the concentration varies to some minor extent. When the concentration of the carbon particles is lowered to a point below the foregoing range, the temperature of the exothermic process begins to vary greatly depending on the concentration.
  • it is not desirable to use such a composite in terms of quality control, because a slight variation in the amount of the carbon particles (for example, graphite) causes substantial differences in the electric characteristics of the products.
  • the means and the composite which make it possible to set the steady state exothermic temperature at a preferred temperature within the same composite without adding a third material, etc. as mentioned above, are desirable.
  • DE-B-2103319 describes an electric heating element wherein electrically conducting particles such as carbon, tin, silver or gold are embedded in a polymer e.g. polyethylene or polypropylene.
  • Self-regulating thermal devices are known from US ⁇ A ⁇ 3793716 and US ⁇ A ⁇ 3619560 which use a conductive carbon block with a crystalline thermoplastic polymeric material such as polyethylene.
  • the present invention intends to solve the problems accompanying conventional heat sensitive-electrically resistant composites. Therefore, the object of this invention is to provide the means and the composites with which a steady state temperature of an exothermic process can be optionally and stably controlled to a preferred temperature with the same composite without depending on the addition of a third material.
  • the foregoing object of this invention is achieved by varying the molecular weight of the PEG with a specified amount of carbon powder dispersed in it, to be high or low, the steady state temperature of an exothermic process is controlled to the necessary temperature for optionally setting the steady state exothermic temperature at either a high or low point.
  • the composites used in this method are obtained by homogeneously mixing carbon powder in an amount of 5 to 45 wt% to 100 wt% of the PEG of 200 to 1 000 000 preferably 200 to 50 000 in average molecular weight.
  • the PEG is used in the form of a single component or a mixture of not less than two types of PEGs.
  • Figures 1 and 2 show the properties of the PEG-carbon powder systems as the heat sensitive-electrically resistant composites (PTCR) in concrete forms, based on the actually measured values.
  • the PTCR shown here are those which are made into the plane heaters by a method that will be described later in the "Embodiments”.
  • carbon powder to be used for the PEG-carbon powder systems various forms of carbon powders can be used. That is, various types of carbon powder products ranging from amorphous carbon black to crystalline graphite are applicable. Also, the mixing ratio for them is as extensive as 5 to 45 wt%.
  • the upper limit is the point where the electric resistance characteristics which are completely identical with those of the carbon resistors are shown, which can be called the boundary between the resistance of the carbon-dispersed system and the carbon resistance.
  • PEG's (from Dai-ichi Kogyo Seiyaku Co., Ltd), Osaka, Japan) #600, #600+#1000 (7:3), #600+#1000 (3:7), #1000, #1540, #2000, #4000, #6000, #10000, and #20000 were used.
  • 27 wt% (however, only for #600, 28 wt%) of graphite (from Nishimura Kokuen Co., Ltd., 90 ⁇ 300 M, average 300 mesh, 45 pm), was added to the respective PEG's. Then, they were mixed by agitation using an ordinary blender.
  • the ten types of composites (PTCR) thus obtained were made into flexible plane heaters as described below, respectively. That is, by using the polyethylene terephthalat films (110 11m) 1,80 mm in width and 300 mm in length and which have fiber layers 4 lining their internal surfaces, each of the abovementioned composites 2 was sandwiched between the films 1 as shown in Figures 4 and 5. Then, on both sides, serrated or saw-tooth copper electrodes 3,6 mm in width and 80 pm in thickness, were provided. In this case, the layer thickness of the PTCR was 120 pm.
  • PTCR composites having the optional steady state exothermic temperatures in the range from 5 to 60°C can be obtained. Also, the PTCR composites thus obtained are excellent in compatibility and show stability even when in the use for a long period of time. Consequently, they can maintain a specified temperature without requiring the use of any temperature control devices, such as a regulator. Accordingly, by using such composites, various types of heat insulating panels which can save energy consumption and which are highly reliable in safety can be obtained for a wide variety of uses.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Thermistors And Varistors (AREA)
  • Resistance Heating (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Claims (2)

1. Procédé pour le contrôle de la température en régime permanent d'un processus exothermique dans des composites électriquement résistants sensibles à la chaleur ayant une quantité donnée de poudre de carbone dispersée dans un composite électriquement résistant sensible à la chaleur d'un système de poudre de polyéthylène glycol et de carbone, la quantité donnée de poudre de carbone étant comprise entre 5 et 45% en poids et la masse moléculaire du polyéthylène glycol étant comprise entre 200 et 1 000 000, dans lequel le régime permanent du processus exothermique est fixé à la température nécessaire en faisant varier la masse moléculaire du polyéthylène glycol.
2. Procédé selon la revendication 1 dans lequel la masse moléculaire du polyéthylène glycol est comprise entre 200 et 50 000.
EP86112658A 1985-09-18 1986-09-12 Procédé pour contrôler la température exothermique stationaire lors de l'utilisation de résistances électriques composites dépendant de la température Expired - Lifetime EP0219678B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86112658T ATE60185T1 (de) 1985-09-18 1986-09-12 Verfahren zum regeln der stationaeren exothermen temperatur bei der verwendung von temperaturabhaengigen elektrischen widerstandsgemischen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60207486A JPS6265401A (ja) 1985-09-18 1985-09-18 感熱電気抵抗組成物における定常発熱温度の調整方法
JP207486/85 1985-09-18

Publications (2)

Publication Number Publication Date
EP0219678A1 EP0219678A1 (fr) 1987-04-29
EP0219678B1 true EP0219678B1 (fr) 1991-01-16

Family

ID=16540532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112658A Expired - Lifetime EP0219678B1 (fr) 1985-09-18 1986-09-12 Procédé pour contrôler la température exothermique stationaire lors de l'utilisation de résistances électriques composites dépendant de la température

Country Status (7)

Country Link
US (1) US4780247A (fr)
EP (1) EP0219678B1 (fr)
JP (1) JPS6265401A (fr)
AT (1) ATE60185T1 (fr)
AU (1) AU571798B2 (fr)
DE (1) DE3676936D1 (fr)
NO (1) NO168678C (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2719946B2 (ja) * 1988-12-24 1998-02-25 繁之 安田 自己温度調節発熱体及びそれを用いたフレキシブル面状発熱体
EP0409393A3 (en) * 1989-07-17 1992-01-15 Metal Manufactures Limited Heating mats
JPH048769A (ja) * 1990-04-27 1992-01-13 Dai Ichi Kogyo Seiyaku Co Ltd 帯電防止性及びイオン導伝性樹脂組成物
US7588029B2 (en) * 2000-03-21 2009-09-15 Fisher & Paykel Healthcare Limited Humidified gases delivery apparatus
US6918389B2 (en) * 2000-03-21 2005-07-19 Fisher & Paykel Healthcare Limited Breathing assistance apparatus
US7111624B2 (en) * 2000-03-21 2006-09-26 Fisher & Paykel Healthcare Limited Apparatus for delivering humidified gases
US7120354B2 (en) * 2000-03-21 2006-10-10 Fisher & Paykel Healthcare Limited Gases delivery conduit
US8206337B2 (en) 2000-10-16 2012-06-26 Fisher & Paykel Healthcare Limited Apparatus used for the humidification of gases in medical procedures
AU2002301057B2 (en) * 2001-09-19 2008-12-11 Fisher & Paykel Healthcare Limited Humidified Gases Delivery Apparatus
NZ518288A (en) * 2002-04-10 2004-09-24 Fisher & Paykel Appliances Ltd Washing appliance water softner
JP5108516B2 (ja) 2004-08-20 2012-12-26 フィッシャー アンド ペイケル ヘルスケア リミテッド 患者に供給されているガスの特性を測定する装置
DE202006005745U1 (de) * 2006-04-06 2007-09-27 Eisele, Michael, Dipl.-Ing. Heizbare Platte, Bahn, Formteil
GB2557124B (en) 2011-06-03 2018-12-12 Fisher & Paykel Healthcare Ltd Medical tubes and methods of manufacture
EP2919840B1 (fr) 2012-11-14 2020-02-12 Fisher & Paykel Healthcare Limited Chauffage de zone pour circuits respiratoires
CN116077787A (zh) 2012-12-04 2023-05-09 费雪派克医疗保健有限公司 医用管以及其制造方法
US10814091B2 (en) 2013-10-24 2020-10-27 Fisher & Paykel Healthcare Limited System for delivery of respiratory gases
GB2558102B (en) 2013-12-20 2018-11-28 Fisher & Paykel Healthcare Ltd Humidification system connections
CN106232167B (zh) 2014-03-17 2020-03-24 费雪派克医疗保健有限公司 用于呼吸系统的医用管
EP4319481A3 (fr) 2015-09-09 2024-04-03 Fisher & Paykel Healthcare Limited Chauffage de zone de circuits respiratoires
US11311695B2 (en) 2016-12-22 2022-04-26 Fisher & Paykel Healthcare Limited Medical tubes and methods of manufacture
KR20210104686A (ko) * 2018-11-07 2021-08-25 리빙 잉크 테크놀로지스, 엘엘씨 생물학적 잉크 및 코팅 및 관련 방법
WO2023170450A1 (fr) * 2022-03-10 2023-09-14 Irpc Public Company Limited Composition conductrice et thermosensible

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59110101A (ja) * 1982-12-15 1984-06-26 安田　繁之 感熱電気抵抗組成物
JPS59162022A (ja) * 1983-03-04 1984-09-12 Kubota Ltd Ｆｒｐ製曲管製造方法
JPS60140692A (ja) * 1983-12-28 1985-07-25 安田　繁之 感熱電気抵抗組成物
JPS6139475A (ja) * 1984-07-31 1986-02-25 安田　繁之 自己温度調節発熱体の定常発熱温度調節方法
US4629584A (en) * 1984-09-11 1986-12-16 Shigeyuki Yasuda Composition of heat-sensitive electrosensitive substances and a panel heater made therefrom

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US3619560A (en) * 1969-12-05 1971-11-09 Texas Instruments Inc Self-regulating thermal apparatus and method
US3673121A (en) * 1970-01-27 1972-06-27 Texas Instruments Inc Process for making conductive polymers and resulting compositions
US3793716A (en) * 1972-09-08 1974-02-26 Raychem Corp Method of making self limiting heat elements
CA1074096A (fr) * 1974-09-27 1980-03-25 David A. Horsma Compositions a coefficient thermique positif
US4277673A (en) * 1979-03-26 1981-07-07 E-B Industries, Inc. Electrically conductive self-regulating article
JPS57126004A (en) * 1981-01-30 1982-08-05 Nippon Unicar Co Ltd Semiconductive polyolefin composition and cable using same
CA1236246A (fr) * 1981-09-09 1988-05-03 Raychem Corporation Compositions electroconductrices a base de polyvinylidene
AU1823283A (en) * 1982-07-09 1984-02-08 Tvi Energy Corp. Electrically conductive laminate having improved resistance stability and its use in heating

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59110101A (ja) * 1982-12-15 1984-06-26 安田　繁之 感熱電気抵抗組成物
JPS59162022A (ja) * 1983-03-04 1984-09-12 Kubota Ltd Ｆｒｐ製曲管製造方法
JPS60140692A (ja) * 1983-12-28 1985-07-25 安田　繁之 感熱電気抵抗組成物
JPS6139475A (ja) * 1984-07-31 1986-02-25 安田　繁之 自己温度調節発熱体の定常発熱温度調節方法
US4629584A (en) * 1984-09-11 1986-12-16 Shigeyuki Yasuda Composition of heat-sensitive electrosensitive substances and a panel heater made therefrom

Also Published As

Publication number Publication date
JPH0342681B2 (fr) 1991-06-28
JPS6265401A (ja) 1987-03-24
NO863720L (no) 1987-03-19
AU571798B2 (en) 1988-04-21
NO863720D0 (no) 1986-09-17
US4780247A (en) 1988-10-25
EP0219678A1 (fr) 1987-04-29
ATE60185T1 (de) 1991-02-15
NO168678C (no) 1992-03-18
DE3676936D1 (de) 1991-02-21
NO168678B (no) 1991-12-09

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